[PATCH v5 1/4] iio: imu: st_lsm6dsx: introduce update_fifo function pointer

[Martin Kepplinger]

From: Lorenzo Bianconi <lorenzo@xxxxxxxxxx>

Introduce update_fifo routine pointer in st_lsm6dsx_fifo_ops data
structure since we will need a different update FIFO configuration
callback adding support for lsm6ds0/lsm9ds1 imu device

Signed-off-by: Lorenzo Bianconi <lorenzo@xxxxxxxxxx>
Tested-by: Martin Kepplinger <martin.kepplinger@xxxxxxx>
---
 drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h       |  4 ++++
 .../iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c    | 19 +++++++++++++++----
 drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c  |  6 ++++++
 3 files changed, 25 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
index 4e8e67ae1632..055e52dec36a 100644
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx.h
@@ -75,6 +75,7 @@ struct st_lsm6dsx_reg {
 	u8 mask;
 };
 
+struct st_lsm6dsx_sensor;
 struct st_lsm6dsx_hw;
 
 struct st_lsm6dsx_odr {
@@ -101,12 +102,14 @@ struct st_lsm6dsx_fs_table_entry {
 
 /**
  * struct st_lsm6dsx_fifo_ops - ST IMU FIFO settings
+ * @update_fifo: Update FIFO configuration callback.
  * @read_fifo: Read FIFO callback.
  * @fifo_th: FIFO threshold register info (addr + mask).
  * @fifo_diff: FIFO diff status register info (addr + mask).
  * @th_wl: FIFO threshold word length.
  */
 struct st_lsm6dsx_fifo_ops {
+	int (*update_fifo)(struct st_lsm6dsx_sensor *sensor, bool enable);
 	int (*read_fifo)(struct st_lsm6dsx_hw *hw);
 	struct {
 		u8 addr;
@@ -327,6 +330,7 @@ int st_lsm6dsx_fifo_setup(struct st_lsm6dsx_hw *hw);
 int st_lsm6dsx_set_watermark(struct iio_dev *iio_dev, unsigned int val);
 int st_lsm6dsx_update_watermark(struct st_lsm6dsx_sensor *sensor,
 				u16 watermark);
+int st_lsm6dsx_update_fifo(struct st_lsm6dsx_sensor *sensor, bool enable);
 int st_lsm6dsx_flush_fifo(struct st_lsm6dsx_hw *hw);
 int st_lsm6dsx_set_fifo_mode(struct st_lsm6dsx_hw *hw,
 			     enum st_lsm6dsx_fifo_mode fifo_mode);
diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
index 2c03a5b80f80..b0f3da1976e4 100644
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c
@@ -602,9 +602,8 @@ int st_lsm6dsx_flush_fifo(struct st_lsm6dsx_hw *hw)
 	return err;
 }
 
-static int st_lsm6dsx_update_fifo(struct iio_dev *iio_dev, bool enable)
+int st_lsm6dsx_update_fifo(struct st_lsm6dsx_sensor *sensor, bool enable)
 {
-	struct st_lsm6dsx_sensor *sensor = iio_priv(iio_dev);
 	struct st_lsm6dsx_hw *hw = sensor->hw;
 	int err;
 
@@ -676,12 +675,24 @@ static irqreturn_t st_lsm6dsx_handler_thread(int irq, void *private)
 
 static int st_lsm6dsx_buffer_preenable(struct iio_dev *iio_dev)
 {
-	return st_lsm6dsx_update_fifo(iio_dev, true);
+	struct st_lsm6dsx_sensor *sensor = iio_priv(iio_dev);
+	struct st_lsm6dsx_hw *hw = sensor->hw;
+
+	if (!hw->settings->fifo_ops.update_fifo)
+		return -ENOTSUPP;
+
+	return hw->settings->fifo_ops.update_fifo(sensor, true);
 }
 
 static int st_lsm6dsx_buffer_postdisable(struct iio_dev *iio_dev)
 {
-	return st_lsm6dsx_update_fifo(iio_dev, false);
+	struct st_lsm6dsx_sensor *sensor = iio_priv(iio_dev);
+	struct st_lsm6dsx_hw *hw = sensor->hw;
+
+	if (!hw->settings->fifo_ops.update_fifo)
+		return -ENOTSUPP;
+
+	return hw->settings->fifo_ops.update_fifo(sensor, false);
 }
 
 static const struct iio_buffer_setup_ops st_lsm6dsx_buffer_ops = {
diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
index 85824d6739ee..0aa93b45d772 100644
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
@@ -154,6 +154,7 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
 			},
 		},
 		.fifo_ops = {
+			.update_fifo = st_lsm6dsx_update_fifo,
 			.read_fifo = st_lsm6dsx_read_fifo,
 			.fifo_th = {
 				.addr = 0x06,
@@ -262,6 +263,7 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
 			},
 		},
 		.fifo_ops = {
+			.update_fifo = st_lsm6dsx_update_fifo,
 			.read_fifo = st_lsm6dsx_read_fifo,
 			.fifo_th = {
 				.addr = 0x06,
@@ -379,6 +381,7 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
 			},
 		},
 		.fifo_ops = {
+			.update_fifo = st_lsm6dsx_update_fifo,
 			.read_fifo = st_lsm6dsx_read_fifo,
 			.fifo_th = {
 				.addr = 0x06,
@@ -490,6 +493,7 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
 			},
 		},
 		.fifo_ops = {
+			.update_fifo = st_lsm6dsx_update_fifo,
 			.read_fifo = st_lsm6dsx_read_tagged_fifo,
 			.fifo_th = {
 				.addr = 0x07,
@@ -616,6 +620,7 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
 			},
 		},
 		.fifo_ops = {
+			.update_fifo = st_lsm6dsx_update_fifo,
 			.read_fifo = st_lsm6dsx_read_tagged_fifo,
 			.fifo_th = {
 				.addr = 0x07,
@@ -719,6 +724,7 @@ static const struct st_lsm6dsx_settings st_lsm6dsx_sensor_settings[] = {
 			},
 		},
 		.fifo_ops = {
+			.update_fifo = st_lsm6dsx_update_fifo,
 			.read_fifo = st_lsm6dsx_read_tagged_fifo,
 			.fifo_th = {
 				.addr = 0x07,
-- 
2.20.1